الفهرس 
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Abstract
HF is a clinical syndrome characterized by typical symptoms (e.g. breathlessness and fatigue). Exercise intolerance is mainly related to heart function and its chronotropic response and is associated with poor prognosis. EC is an important prognostic determinant of cardiovascular and overall mortality. Echocardiography is not sensitive enough for assessment of EC.Exercise stress test is used to estimate prognosis and to determine EC. The current study aimed to assess the echocardiographic parameters that correlate with the METs as measured by exercise stress testing as an objective measure of functional capacity of patients with chronic HF. The study was conducted on 40 patients with chronic HF with reduced ejection fraction (HFrEF) in sinus rhythm, able to exercise, NYHA classification I or II who were presented to outpatient clinic of cardiovascular department in Mansoura University.All patients have been subjected to thorough history taking, general and local cardiac examination, ECG, transthoracic echocardiography and exercise stress test. Results: There is a statistically significant correlation between METs and each LVESD, LVESV, TAPSE, RVSP, and E/E’. The p-value=0.04, 0.03, 0.02, 0.01, and 0.02, respectively. The difference between the two groups of METs was statistically significant regarding TAPSE, RVSP and E/E’, p-value= 0.01, 0.02, and 0.01, respectively. Multivariate regression analysis among the echocardiographic variables revealed that TAPSE and RVSP are the independent predictor of EC measured by METS, p=0.01 and 0.04, respectively.